UNUSUAL! NEWLY HATCHED WASP/SAWFLY?

Observation - UNUSUAL! NEWLY HATCHED WASP/SAWFLY? - Global. Description: Found 'resting' in a young Larch - seemed very lethargic though making 'wasp-like' head movements - Quite large c2cm body length - perhaps this had just hatched , waiting for colour and wings to develop as happens with dragonflies?? Expert opinion much ap

Found 'resting' in a young Larch - seemed very lethargic though making 'wasp-like' head movements - Quite large c2cm body length - perhaps this had just hatched , waiting for colour and wings to develop as happens with dragonflies?? Expert opinion much appreciated!